PhotoSwipe中文API(一)

2021-07-09 10:53:50 浏览数 (1)

入门

您应知道之前先做起事情：

  1. PhotoSwipe不是一个简单的jQuery插件，至少基本的JavaScript知识才能安装。
  2. PhotoSwipe需要预定义的图像尺寸（更多关于这一点）。
  3. 如果您在非回应网站上使用PhotoSwipe - 控制将在移动进行换算（整页缩放）。所以你需要实现自定义控件（在右上角例如单个大关闭按钮）。
  4. 文档中所有的代码是纯香草JS和支持IE8及以上。如果您的网站或应用程序使用了一些JavaScript框架（像jQuery或MooTools的），或者你并不需要支持旧的浏览器 - 随意简化代码。
  5. 避免对移动服务的大图像（大于2000x1500px），因为它们会极大地降低动画性能，并可能导致崩溃（尤其是iOS上的Safari浏览器）。可能的解决方案：一个单独的网页上投放响应图像，或者打开的图像，或者（在常见问题解答更多）使用支持平铺图像（如传单）库。

初始化

第1步：包括JS和CSS文件

您可以在GitHub的信息库DIST/文件夹中找到它们。萨斯和未编译的JS文件夹中的src /。我建议使用无礼的话，如果你打算修改现有的样式，有代码的结构和评述。https://github.com/dimsemenov/PhotoSwipe

代码语言：javascript复制
<!-- Core CSS file -->
<link rel="stylesheet" href="path/to/photoswipe.css"> 

<!-- Skin CSS file (styling of UI - buttons, caption, etc.)
     In the folder of skin CSS file there are also:
     - .png and .svg icons sprite, 
     - preloader.gif (for browsers that do not support CSS animations) -->
<link rel="stylesheet" href="path/to/default-skin/default-skin.css"> 

<!-- Core JS file -->
<script src="path/to/photoswipe.min.js"></script> 

<!-- UI JS file -->
<script src="path/to/photoswipe-ui-default.min.js"></script>

不要紧，如何以及在哪里将包括JS和CSS文件。只有当你调用新PhotoSwipe代码被执行（）。可以随意推迟文件加载，如果你不需要PhotoSwipe被初步打开。

PhotoSwipe还支持AMD装载机（如RequireJS）和CommonJS的，使用起来就像这样：

代码语言：javascript复制
require([ 
        'path/to/photoswipe.js', 
        'path/to/photoswipe-ui-default.js' 
    ], function( PhotoSwipe, PhotoSwipeUI_Default ) {

    //      var gallery = new PhotoSwipe( someElement, PhotoSwipeUI_Default ...
    //      gallery.init() 
    //      ...

});

而且，您可以通过鲍尔安装（安装鲍尔photoswipe），或NPM（NPM安装photoswipe）。

第2步：PhotoSwipe（.pswp）元素添加到DOM

您可以通过JS动态添加HTML代码（直接在初始化之前），或者有它的页面开始（喜欢它的演示页面上完成）。该代码可以在任何地方附加，但理想的结束</ body>之前。 （你用相同的UI类只要）你可以重复使用它在多个画廊。

代码语言：javascript复制
<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">

    <!-- Background of PhotoSwipe. 
         It's a separate element as animating opacity is faster than rgba(). -->
    <div class="pswp__bg"></div>

    <!-- Slides wrapper with overflow:hidden. -->
    <div class="pswp__scroll-wrap">

        <!-- Container that holds slides. 
            PhotoSwipe keeps only 3 of them in the DOM to save memory.
            Don't modify these 3 pswp__item elements, data is added later on. -->
        <div class="pswp__container">
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
        </div>

        <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
        <div class="pswp__ui pswp__ui--hidden">

            <div class="pswp__top-bar">

                <!--  Controls are self-explanatory. Order can be changed. -->

                <div class="pswp__counter"></div>

                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                <button class="pswp__button pswp__button--share" title="Share"></button>

                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                      <div class="pswp__preloader__cut">
                        <div class="pswp__preloader__donut"></div>
                      </div>
                    </div>
                </div>
            </div>

            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div> 
            </div>

            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>

            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>

            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>

        </div>

    </div>

</div>

pswp__bg，pswp__scroll换行，pswp__container和pswp__item元素的顺序不应改变。

你可能会问，为什么PhotoSwipe不通过JS自动添加该代码，原因很简单 - 只是为了节省文件大小的情况下，如果你需要的布局做一些修改。

步骤3：初始化

执行PhotoSwipe构造函数。它接受4个参数：

从步骤2（它必须被添加到DOM）.pswp元件。

PhotoSwipe UI类。如果包括了默认photoswipe-UI-default.js，类将是PhotoSwipeUI_Default。可以是假的。

与对象（幻灯片）阵列。

options

代码语言：javascript复制
{
    src: 'https://placekitten.com/600/400',
    w: 600,
    h: 400
},
{
    src: 'https://placekitten.com/1200/900',
    w: 1200,
    h: 900
}

// define options (if needed) var options = {

};

在最后你应该得到的东西是这样的：

html:

代码语言：javascript复制
<button id="btn">Open PhotoSwipe</button>
<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
    <!-- Background of PhotoSwipe. 
         It's a separate element, as animating opacity is faster than rgba(). -->
    <div class="pswp__bg"></div>
    <!-- Slides wrapper with overflow:hidden. -->
    <div class="pswp__scroll-wrap">
        <!-- Container that holds slides. PhotoSwipe keeps only 3 slides in DOM to save memory. -->
        <div class="pswp__container">
            <!-- don't modify these 3 pswp__item elements, data is added later on -->
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
        </div>
        <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
        <div class="pswp__ui pswp__ui--hidden">
            <div class="pswp__top-bar">
                <!--  Controls are self-explanatory. Order can be changed. -->
                <div class="pswp__counter"></div>
                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
                <button class="pswp__button pswp__button--share" title="Share"></button>
                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                      <div class="pswp__preloader__cut">
                        <div class="pswp__preloader__donut"></div>
                      </div>
                    </div>
                </div>
            </div>
            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div> 
            </div>
            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>
            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>
            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>
          </div>
        </div>
</div>

js :

代码语言：javascript复制
var openPhotoSwipe = function() {
    var pswpElement = document.querySelectorAll('.pswp')[0];
    // build items array
    var items = [
        {
            src: 'https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_b.jpg',
            w: 964,
            h: 1024
        },
        {
            src: 'https://farm7.staticflickr.com/6175/6176698785_7dee72237e_b.jpg',
            w: 1024,
            h: 683
        }
    ];
    // define options (if needed)
    var options = {
             // history & focus options are disabled on CodePen        
        history: false,
        focus: false,
        showAnimationDuration: 0,
        hideAnimationDuration: 0  
    };
    var gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
    gallery.init();
};
openPhotoSwipe();
document.getElementById('btn').onclick = openPhotoSwipe;

结果：

代码语言：javascript复制
![940.png][2]

创建幻灯片对象的数组

数组应包含有关幻灯片数据中的每个对象，也可以是你希望在PhotoSwipe显示任何东西 - 路径图像，标题字符串，股数，评论等。

默认情况下PhotoSwipe只使用了5个属性：SRC（路径图），W（图像宽度），H（图像高度），MSRC（路径的小图像占位符，大的图像会在上面装），HTML（自定义HTML，更 关于它）。

在导航，PhotoSwipe增加自己的属性到这个对象（如MINZOOM或加载）。

代码语言：javascript复制
var slides = [
    // slide 1
    {
        src: 'path/to/image1.jpg', // path to image
        w: 1024, // image width
        h: 768, // image height
        msrc: 'path/to/small-image.jpg', // small image placeholder,
                        // main (large) image loads on top of it,
                        // if you skip this parameter - grey rectangle will be displayed,
                        // try to define this property only when small image was loaded before
        title: 'Image Caption'  // used by Default PhotoSwipe UI
                                // if you skip it, there won't be any caption
        // You may add more properties here and use them.
        // For example, demo gallery uses "author" property, which is used in the caption.
        // author: 'John Doe'

    },
    // slide 2
    {
        src: 'path/to/image2.jpg', 
        w: 600, 
        h: 600
        // etc.
    }
    // etc.

];

您可以动态地定义幻灯片对象的属性PhotoSwipe读取它们直接之前，使用gettingData事件（在文档的API部分的更多信息）。例如，该技术可用于为不同的屏幕尺寸不同的图像。

如何从一个链接列表建立幻灯片的数组

让我们假设你有一个看起来像这样（约画廊的标记更多信息）的链接/缩略图列表：

代码语言：javascript复制
<div class="my-gallery" itemscope itemtype="http://schema.org/ImageGallery">
    <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
        <a href="large-image.jpg" itemprop="contentUrl" data-size="600x400">
            <img src="small-image.jpg" itemprop="thumbnail" alt="Image description" />
        </a>
        <figcaption itemprop="caption description">Image caption</figcaption>
    </figure>
    <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
        <a href="large-image.jpg" itemprop="contentUrl" data-size="600x400">
            <img src="small-image.jpg" itemprop="thumbnail" alt="Image description" />
        </a>
        <figcaption itemprop="caption description">Image caption</figcaption>
    </figure>
</div>

..你要点击缩略图与大型图像打开PhotoSwipe（喜欢它的演示页上完成）。所有你需要做的是：

  1. 绑定click事件链接/缩略图。
  2. 用户点击缩略图后，找到它的索引。
  3. 创建DOM元素幻灯片对象的数组 - 通过各环节循环和检索href属性（大图像URL），数据大小属性（其大小），缩略图的SRC和字幕的内容。

PhotoSwipe并不真正关心你将如何做到这一点。如果你使用像jQuery或MooTools的框架，或者如果你不需要支持IE8，代码可以大大简化。

这里是纯香草JS实现与IE8的支持：

代码语言：javascript复制
var initPhotoSwipeFromDOM = function(gallerySelector) {
    // parse slide data (url, title, size ...) from DOM elements 
    // (children of gallerySelector)
    var parseThumbnailElements = function(el) {
        var thumbElements = el.childNodes,
            numNodes = thumbElements.length,
            items = [],
            figureEl,
            linkEl,
            size,
            item;
        for(var i = 0; i < numNodes; i  ) {
            figureEl = thumbElements[i]; // <figure> element
            // include only element nodes 
            if(figureEl.nodeType !== 1) {
                continue;
            }
            linkEl = figureEl.children[0]; // <a> element
            size = linkEl.getAttribute('data-size').split('x');
            // create slide object
            item = {
                src: linkEl.getAttribute('href'),
                w: parseInt(size[0], 10),
                h: parseInt(size[1], 10)
            };
            if(figureEl.children.length > 1) {
                // <figcaption> content
                item.title = figureEl.children[1].innerHTML; 
            }
            if(linkEl.children.length > 0) {
                // <img> thumbnail element, retrieving thumbnail url
                item.msrc = linkEl.children[0].getAttribute('src');
            } 
            item.el = figureEl; // save link to element for getThumbBoundsFn
            items.push(item);
        }
        return items;
    };
    // find nearest parent element
    var closest = function closest(el, fn) {
        return el && ( fn(el) ? el : closest(el.parentNode, fn) );
    };
    // triggers when user clicks on thumbnail
    var onThumbnailsClick = function(e) {
        e = e || window.event;
        e.preventDefault ? e.preventDefault() : e.returnValue = false;
        var eTarget = e.target || e.srcElement;
        // find root element of slide
        var clickedListItem = closest(eTarget, function(el) {
            return (el.tagName && el.tagName.toUpperCase() === 'FIGURE');
        });
        if(!clickedListItem) {
            return;
        }
        // find index of clicked item by looping through all child nodes
        // alternatively, you may define index via data- attribute
        var clickedGallery = clickedListItem.parentNode,
            childNodes = clickedListItem.parentNode.childNodes,
            numChildNodes = childNodes.length,
            nodeIndex = 0,
            index;
        for (var i = 0; i < numChildNodes; i  ) {
            if(childNodes[i].nodeType !== 1) { 
                continue; 
            }
            if(childNodes[i] === clickedListItem) {
                index = nodeIndex;
                break;
            }
            nodeIndex  ;
        }
        if(index >= 0) {
            // open PhotoSwipe if valid index found
            openPhotoSwipe( index, clickedGallery );
        }
        return false;
    };
    // parse picture index and gallery index from URL (#&pid=1&gid=2)
    var photoswipeParseHash = function() {
        var hash = window.location.hash.substring(1),
        params = {};

        if(hash.length < 5) {
            return params;
        }
        var vars = hash.split('&');
        for (var i = 0; i < vars.length; i  ) {
            if(!vars[i]) {
                continue;
            }
            var pair = vars[i].split('=');  
            if(pair.length < 2) {
                continue;
            }           
            params[pair[0]] = pair[1];
        }
        if(params.gid) {
            params.gid = parseInt(params.gid, 10);
        }
        return params;
    };
    var openPhotoSwipe = function(index, galleryElement, disableAnimation, fromURL) {
        var pswpElement = document.querySelectorAll('.pswp')[0],
            gallery,
            options,
            items;
        items = parseThumbnailElements(galleryElement);
        // define options (if needed)
        options = {
            // define gallery index (for URL)
            galleryUID: galleryElement.getAttribute('data-pswp-uid'),
            getThumbBoundsFn: function(index) {
                // See Options -> getThumbBoundsFn section of documentation for more info
                var thumbnail = items[index].el.getElementsByTagName('img')[0], // find thumbnail
                    pageYScroll = window.pageYOffset || document.documentElement.scrollTop,
                    rect = thumbnail.getBoundingClientRect(); 
                return {x:rect.left, y:rect.top   pageYScroll, w:rect.width};
            }
        };
        // PhotoSwipe opened from URL
        if(fromURL) {
            if(options.galleryPIDs) {
                // parse real index when custom PIDs are used 
                // http://photoswipe.com/documentation/faq.html#custom-pid-in-url
                for(var j = 0; j < items.length; j  ) {
                    if(items[j].pid == index) {
                        options.index = j;
                        break;
                    }
                }
            } else {
                // in URL indexes start from 1
                options.index = parseInt(index, 10) - 1;
            }
        } else {
            options.index = parseInt(index, 10);
        }
        // exit if index not found
        if( isNaN(options.index) ) {
            return;
        }
        if(disableAnimation) {
            options.showAnimationDuration = 0;
        }
        // Pass data to PhotoSwipe and initialize it
        gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
        gallery.init();
    };
    // loop through all gallery elements and bind events
    var galleryElements = document.querySelectorAll( gallerySelector );
    for(var i = 0, l = galleryElements.length; i < l; i  ) {
        galleryElements[i].setAttribute('data-pswp-uid', i 1);
        galleryElements[i].onclick = onThumbnailsClick;
    }
    // Parse URL and open gallery if it contains #&pid=3&gid=1
    var hashData = photoswipeParseHash();
    if(hashData.pid && hashData.gid) {
        openPhotoSwipe( hashData.pid ,  galleryElements[ hashData.gid - 1 ], true, true );
    }
};
// execute above function
initPhotoSwipeFromDOM('.my-gallery');

例如在CodePen（重点和历史选项被禁用，由于嵌入的问题）：

代码语言：javascript复制
<h2>First gallery:</h2>
  <div class="my-gallery" itemscope itemtype="http://schema.org/ImageGallery">
    <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
      <a href="https://farm3.staticflickr.com/2567/5697107145_a4c2eaa0cd_o.jpg" itemprop="contentUrl" data-size="1024x1024">
          <img src="https://farm3.staticflickr.com/2567/5697107145_3c27ff3cd1_m.jpg" itemprop="thumbnail" alt="Image description" />
      </a>
      <figcaption itemprop="caption description">Image caption  1</figcaption>                                     
    </figure>

    <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
      <a href="https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_b.jpg" itemprop="contentUrl" data-size="964x1024">
          <img src="https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_m.jpg" itemprop="thumbnail" alt="Image description" />
      </a>
      <figcaption itemprop="caption description">Image caption 2</figcaption>
    </figure>

    <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
      <a href="https://farm7.staticflickr.com/6175/6176698785_7dee72237e_b.jpg" itemprop="contentUrl" data-size="1024x683">
          <img src="https://farm7.staticflickr.com/6175/6176698785_7dee72237e_m.jpg" itemprop="thumbnail" alt="Image description" />
      </a>
      <figcaption itemprop="caption description">Image caption 3</figcaption>
    </figure>

    <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
      <a href="https://farm6.staticflickr.com/5023/5578283926_822e5e5791_b.jpg" itemprop="contentUrl" data-size="1024x768">
          <img src="https://farm6.staticflickr.com/5023/5578283926_822e5e5791_m.jpg" itemprop="thumbnail" alt="Image description" />
      </a>
      <figcaption itemprop="caption description">Image caption 4</figcaption>
    </figure>
  </div>
<h2>Second gallery:</h2>
  <div class="my-gallery" itemscope itemtype="http://schema.org/ImageGallery">
    <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
      <a href="https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_b.jpg" itemprop="contentUrl" data-size="964x1024">
          <img src="https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_m.jpg" itemprop="thumbnail" alt="Image description" />
      </a>
      <figcaption itemprop="caption description">Image caption 2.1</figcaption>
    </figure>

    <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
      <a href="https://farm7.staticflickr.com/6175/6176698785_7dee72237e_b.jpg" itemprop="contentUrl" data-size="1024x683">
          <img src="https://farm7.staticflickr.com/6175/6176698785_7dee72237e_m.jpg" itemprop="thumbnail" alt="Image description" />
      </a>
      <figcaption itemprop="caption description">Image caption 2.2</figcaption>
    </figure>

    <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
      <a href="https://farm6.staticflickr.com/5023/5578283926_822e5e5791_b.jpg" itemprop="contentUrl" data-size="1024x768">
          <img src="https://farm6.staticflickr.com/5023/5578283926_822e5e5791_m.jpg" itemprop="thumbnail" alt="Image description" />
      </a>
      <figcaption itemprop="caption description">Image caption 2.3</figcaption>
    </figure>
  </div>
<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
    <!-- Background of PhotoSwipe. 
         It's a separate element, as animating opacity is faster than rgba(). -->
    <div class="pswp__bg"></div>
    <!-- Slides wrapper with overflow:hidden. -->
    <div class="pswp__scroll-wrap">
        <!-- Container that holds slides. PhotoSwipe keeps only 3 slides in DOM to save memory. -->
        <!-- don't modify these 3 pswp__item elements, data is added later on. -->
        <div class="pswp__container">
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
        </div>
        <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
        <div class="pswp__ui pswp__ui--hidden">
            <div class="pswp__top-bar">
                <!--  Controls are self-explanatory. Order can be changed. -->
                <div class="pswp__counter"></div>
                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
                <button class="pswp__button pswp__button--share" title="Share"></button>
                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                      <div class="pswp__preloader__cut">
                        <div class="pswp__preloader__donut"></div>
                      </div>
                    </div>
                </div>
            </div>
            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div> 
            </div>
            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>
            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>
            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>
          </div>
        </div>
</div>
代码语言：javascript复制
.my-gallery {
  width: 100%;
  float: left;
}
.my-gallery img {
  width: 100%;
  height: auto;
}
.my-gallery figure {
  display: block;
  float: left;
  margin: 0 5px 5px 0;
  width: 150px;
}
.my-gallery figcaption {
  display: none;
}
代码语言：javascript复制
var initPhotoSwipeFromDOM = function(gallerySelector) {
    // parse slide data (url, title, size ...) from DOM elements 
    // (children of gallerySelector)
    var parseThumbnailElements = function(el) {
        var thumbElements = el.childNodes,
            numNodes = thumbElements.length,
            items = [],
            figureEl,
            linkEl,
            size,
            item;
        for(var i = 0; i < numNodes; i  ) {
            figureEl = thumbElements[i]; // <figure> element
            // include only element nodes 
            if(figureEl.nodeType !== 1) {
                continue;
            }
            linkEl = figureEl.children[0]; // <a> element
            size = linkEl.getAttribute('data-size').split('x');
            // create slide object
            item = {
                src: linkEl.getAttribute('href'),
                w: parseInt(size[0], 10),
                h: parseInt(size[1], 10)
            };
            if(figureEl.children.length > 1) {
                // <figcaption> content
                item.title = figureEl.children[1].innerHTML; 
            }
            if(linkEl.children.length > 0) {
                // <img> thumbnail element, retrieving thumbnail url
                item.msrc = linkEl.children[0].getAttribute('src');
            } 
            item.el = figureEl; // save link to element for getThumbBoundsFn
            items.push(item);
        }
        return items;
    };
    // find nearest parent element
    var closest = function closest(el, fn) {
        return el && ( fn(el) ? el : closest(el.parentNode, fn) );
    };
    // triggers when user clicks on thumbnail
    var onThumbnailsClick = function(e) {
        e = e || window.event;
        e.preventDefault ? e.preventDefault() : e.returnValue = false;
        var eTarget = e.target || e.srcElement;
        // find root element of slide
        var clickedListItem = closest(eTarget, function(el) {
            return (el.tagName && el.tagName.toUpperCase() === 'FIGURE');
        });
        if(!clickedListItem) {
            return;
        }
        // find index of clicked item by looping through all child nodes
        // alternatively, you may define index via data- attribute
        var clickedGallery = clickedListItem.parentNode,
            childNodes = clickedListItem.parentNode.childNodes,
            numChildNodes = childNodes.length,
            nodeIndex = 0,
            index;
        for (var i = 0; i < numChildNodes; i  ) {
            if(childNodes[i].nodeType !== 1) { 
                continue; 
            }
            if(childNodes[i] === clickedListItem) {
                index = nodeIndex;
                break;
            }
            nodeIndex  ;
        }
        if(index >= 0) {
            // open PhotoSwipe if valid index found
            openPhotoSwipe( index, clickedGallery );
        }
        return false;
    };
    // parse picture index and gallery index from URL (#&pid=1&gid=2)
    var photoswipeParseHash = function() {
        var hash = window.location.hash.substring(1),
        params = {};
        if(hash.length < 5) {
            return params;
        }
        var vars = hash.split('&');
        for (var i = 0; i < vars.length; i  ) {
            if(!vars[i]) {
                continue;
            }
            var pair = vars[i].split('=');  
            if(pair.length < 2) {
                continue;
            }           
            params[pair[0]] = pair[1];
        }
        if(params.gid) {
            params.gid = parseInt(params.gid, 10);
        }
        return params;
    };
    var openPhotoSwipe = function(index, galleryElement, disableAnimation, fromURL) {
        var pswpElement = document.querySelectorAll('.pswp')[0],
            gallery,
            options,
            items;
        items = parseThumbnailElements(galleryElement);
        // define options (if needed)
        options = {
            // define gallery index (for URL)
            galleryUID: galleryElement.getAttribute('data-pswp-uid'),
            getThumbBoundsFn: function(index) {
                // See Options -> getThumbBoundsFn section of documentation for more info
                var thumbnail = items[index].el.getElementsByTagName('img')[0], // find thumbnail
                    pageYScroll = window.pageYOffset || document.documentElement.scrollTop,
                    rect = thumbnail.getBoundingClientRect(); 

                return {x:rect.left, y:rect.top   pageYScroll, w:rect.width};
            }
        };

        // PhotoSwipe opened from URL
        if(fromURL) {
            if(options.galleryPIDs) {
                // parse real index when custom PIDs are used 
                // http://photoswipe.com/documentation/faq.html#custom-pid-in-url
                for(var j = 0; j < items.length; j  ) {
                    if(items[j].pid == index) {
                        options.index = j;
                        break;
                    }
                }
            } else {
                // in URL indexes start from 1
                options.index = parseInt(index, 10) - 1;
            }
        } else {
            options.index = parseInt(index, 10);
        }

        // exit if index not found
        if( isNaN(options.index) ) {
            return;
        }

        if(disableAnimation) {
            options.showAnimationDuration = 0;
        }

        // Pass data to PhotoSwipe and initialize it
        gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
        gallery.init();
    };

    // loop through all gallery elements and bind events
    var galleryElements = document.querySelectorAll( gallerySelector );

    for(var i = 0, l = galleryElements.length; i < l; i  ) {
        galleryElements[i].setAttribute('data-pswp-uid', i 1);
        galleryElements[i].onclick = onThumbnailsClick;
    }

    // Parse URL and open gallery if it contains #&pid=3&gid=1
    var hashData = photoswipeParseHash();
    if(hashData.pid && hashData.gid) {
        openPhotoSwipe( hashData.pid ,  galleryElements[ hashData.gid - 1 ], true, true );
    }
};

// execute above function
initPhotoSwipeFromDOM('.my-gallery');

提示：您可以从CodePen例如下载在本地发挥它（编辑上CodePen - >分享 - >导出.zip文件）。

如果您使用的标记，从这个例子不同，你需要编辑功能解析缩略图元素。

如果你没有在纯JavaScript经验，不知道如何解析DOM，请参阅怪异模式和文档在MSDN上。

需要注意的是IE8不支持HTML5<图>和<figcaption>元素，所以你需要在<head>部分（托管版本的例子中使用cdnjs）html5shiv：

代码语言：javascript复制
<!--[if lt IE 9]>
    <script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.2/html5shiv.min.js"></script>
<![endif]-->
html html5 javascript jquery 编程算法

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